try this one http://www.speedwaymotors.com/1947-1954-Chevy-Pickup-Power-Brake-Pedal-***embly,8903.html
Stock frame, S-10 Frame, Subframed Or???? With a stock frame the original pedal ***embly works if you use a booster/master cylinder setup like Noname showed or build a bracket to mount the master cylinder. If you have the stock frame and don't have any pedal ***embly the setup from speedway probably will run you less than gas for hunting a stock ***embly or ebay and shipping will especially if you run an automatic. I don't have power brakes at this time and built a bracket that bolts on in place of the stock master cylinder and mounts a 68 C-10 drum brake dual master cylinder for my drum front and rear setup. I had to fab the bracket and build an extended brake pushrod that was stout enough so it wouldn't flex or bend.